15=(12-x)+(9-x)

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Solution for 15=(12-x)+(9-x) equation:


Simplifying
15 = (12 + -1x) + (9 + -1x)

Remove parenthesis around (12 + -1x)
15 = 12 + -1x + (9 + -1x)

Remove parenthesis around (9 + -1x)
15 = 12 + -1x + 9 + -1x

Reorder the terms:
15 = 12 + 9 + -1x + -1x

Combine like terms: 12 + 9 = 21
15 = 21 + -1x + -1x

Combine like terms: -1x + -1x = -2x
15 = 21 + -2x

Solving
15 = 21 + -2x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2x' to each side of the equation.
15 + 2x = 21 + -2x + 2x

Combine like terms: -2x + 2x = 0
15 + 2x = 21 + 0
15 + 2x = 21

Add '-15' to each side of the equation.
15 + -15 + 2x = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 2x = 21 + -15
2x = 21 + -15

Combine like terms: 21 + -15 = 6
2x = 6

Divide each side by '2'.
x = 3

Simplifying
x = 3

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